Terrain3D v0.8.1-alpha_gd4.1.1

v0.8.1 Alpha release for Godot 4.1.1
Linux & Windows include both debug & release libraries.

Updates:

• Fix smoothing over regions causing an artifact
• Fix Raycasting returning null. Now returns terrain3d object
• Expose cast_shadows and render layers
• Fixes for building OSX & Linux
• Extras: Fix project_on_terrain3d for HungryProton's newest version of Scatter
• Demo: Fix F8 not quitting on export
• Internal: Restructure update code

Edit: I forgot to add the demo to the packages. It has been added.
7/24 Edit: I also forgot to add the project file so the demo will run. Files updated.